It should work very well with a burn rate similar to IMR4198, I bet it works great for the 77-90gr bullets and maybe even a little heavier if it's a little slower than IMR4198 which didnt do so well with the 115gr bullets MS tested not long ago.
I finally got to load some 556 and 6.8 ammo with the new SPP 210 powder (similar to IMR 4198 according to Wideners). Used very conservative 4198 loads, in fact only the minimum in the 223/556 18.5 gr & 64 gr Gold Dot which I shot in a bolt action rifle. There were no pressure signs on the brass and that was before I pulled out my old PACT chrono, so I don't have velocity.
Loaded up some 6.8 ammo for my ARP 16", 6.8 x 43 NITRO W/M-4 Ext and again started low. new SSA small rifle primer brass, CCI 41 primers and seated 2.82 for Rem 100 gr sp, 2.80 for 85 TSX, C-Products magazine.
100 gr Rem sp @ 22 gr SPP 210, four shots for an average of 2144 fps, no pressure signs on brass, 85 TSX one shot (they're expensive) 2166.8
100 gr Rem sp @ 23 gr SPP 210, four shots for an average of 2206.9 fps, no pressure signs on brass, 85 TSX one shot 2201.4
100 gr Rem sp @ 24 gr SPP 210, four shots 2357.1 and the same for the 85 TSX--Not sure the chrono was working right here, the first reading was 2302.2 and it seems to be the more valid, 2357.1 may be an average with the first set, forgot which buttons to cancel and start over but turned off and started over for the next round
100 gr Rem sp @ 24.8 gr SPP 210, four shots at an average 2359.9. 2375 for the 85 TSX. primers flat, slight swipes
Obviously still a bit low on velocity. Ordered some 90 gr Sierras and more 85 TSX.
Last edited by gdaddybill; 06-09-2011 at 03:25 PM.
Reason: data may have been misleading
Powder appears to fast, if your seeing pressure signs at only 2350 fps with a 100gr bullet I would abandon ship and start with a new powder.
I tested Hornady factory powder for their .223 40gr V-Max load last year in my 6.8 with the 90gr TNT with similar results to yours. I started at 27gr(2150 fps) and worked up to max pressure at 29gr(2347 fps), the powder was just to fast for the 6.8 even with light bullets.
Try AA2200, I've been using it for a year next week and it has preformed great for me in every loading from 90-130gr bullets, some more recent users have even loaded the 135gr SMK with great results(~2500 =20" barrel), with a 100gr AB and 31gr of 2200(work up for your barrel) I got 2880 fps from my 16" barrel so I expect ~2950+ from my 18" barrel which is great for a 100gr bullet.